Steam valve



Seplt. 28 1926.

Filed Nov. 24, 1924 Patented sept. as, i926. l l I UMTED STATES PATENT ori-"ICE,

PASQUALE PASCALE, OF NEW YORK, N'. Y., ASSIGNOR TO DRI-STEAM VALVE COR- PORATIOIT, OF NEW YORK, N. Y.,

A CORPORATION OF DELAWARE.

STEAM VALVE.

Application filed November 24, 1924. SerialrNo. 751,796.

This invention relates to steam valves of the type such as is disclosed in the speciiication of my patent application No. 545,633, now Patent No. 1,567,612, issued Dec. 29, 1925, in which a stop valve adapted to engage with a valve seating for positively closing the valve is combined with means for drying and controlling the passage of the steam, such means comprising a valve member preferably cylindrical, forming an extension of said stop valve, and provided with a plurality .of perforations through which the steam is adapted torpass and therebyto be dried, the controlling of the passage of the steam being effected by moving said valve member longitudinally and thereby causing a greater or lesser number of openings to be open for the passage ori steam according to the direction of movement.

The objects of the present invention are to provide improved means for by-passing the steam around the said openings and to provide such a valve which is adapted to function as a non-return valve.

With these objects in view my invention consists in the constructions, combinations and arrangements of parts herein described and claimed.

In order that the invention may be clearly understood reference is made to the accom-V panying drawing which illustrates by way s of example an embodiment of my invention,

such drawing being a sectional elevation of a non-return valvev having my improvements applied thereto.

Referring to the drawing, 1 indicates a valve casing provided with an inlet 2, an outlet 3 and a conical seating 4 Jfor thev stop valve 5. The stop valve 5 is provided with a cylindrical extension 6 which is adapted to slide in the cylindrical casing 7 the upper end of which forms the seating 4. Said cylindrical extension is provided with a plurality of pcrforations 8 through which the steam is adapted to pass when the stop valve 5 is raised from the seating 4 and such perforations are raised above the seating. .The end of the cylindrical extension 6 remote from the stop valve 5', is provided with a number of ports 9 which are of such size that when the valve 5, 6, is raised to such extent that said ports are clear of the seating 4, a free passage for the steam will be provided for independently of the perforations 8.

As is clearly shown in the drawing, the cylindrical extension 6 extends beyond the ports 9 and such extension, which is adapted to have a sliding lit within the cylindrical casing 7, forms a guide forv the valve.

`which a piston 14 may slide, said piston 14 being rigidly connected to the valve member 5 by means of the extension 15 on said valve member on the end voit which, said piston 14 is mounted. Such extension 15 valso serves as additional guiding means for the piston 5,6 since it is adapted to slide in the bearing 16 supported from the cylindrical member 13 and arranged coaxially therewith. A gas tight lit between the piston 14 and the cylinder 13 is ensured by the piston rings 17 with which such piston is provided, and the said piston 14 is provided with one or more small holes 18y for the passage of steam, whereby both sides of such piston are always under the same pressure. The piston 12 thus Vforms means for balancing the valve 5. Y

Means are provided for closing the valve 5, 6, and for controlling the extent of openingof such valve, such means comprising lan adjustable kstop 19 which is adapted to engage tlie upper end of the' extension 15. The adjustment of such stop is effected by the hand wheel 20 which is keyed to they nut 21 supported in the bearing 22 above the casing 1, and is in screw threaded engagement with the screw threaded extension 23 of the stop 19.

The stop 19 is provided with a pointer 24 which co-operates with a scale 25 mounted upon one of the supports 26 of the bearing 19, so as to indicate the extent to which the valve 5, 6 may open.

Preferably mounted upon the valve member 5 in such manner as to surround the perforated part of the cylindrical extension 6, is a circular cage 27 comprising a plurality of va-nes 28 of segmental shape through which the steam passes on its way to the outlet 3 after passing through the perforations 8.

A spring 29 surrounding the extension and extending between the valve member 5 and the bearing 16 is preferably provided for ensuring that the valve 5, G will close when the pressure on the inlet side ot such valve is below the pressure on the outlet side.

The operation oit the valve is such that when the adjustable stop is raised to allow a partial opening of the valve the steam pressure on the under side ot the valve 5 will raise the valve to tne extent allowed by the stop 19. ln such position, only a certain proportion of the peritorations 8 will be raised clear of the seating l and the volume of steam passinO through such perforation will depend upon the number ot perforations which are raised clear of the seating. When all of the perforations are raised above the seating the valve will be open to its full extent, allowing of the passage ot the maximum amount of steam and all of such steam will pass through the perforations and be dried thereby. There is a tendency however' in such valves for such perorations to become clogged during operation of the valve and il' this happens, the maximum quantity of steam will not be able to pass through the 4valve and for this reason, and so as to provide for a free passage of steam when this is desired for any reason, the ports 9 are provided in the ef;- tension 6, such ports when completely uncovered permitting a free passage of the maximum quantity of steam and being so arranged that such free passage can be provided for without the extension 6 having to be completely raised above the seating l.

Vhat I claim is 1. A steam valve comprising in combination, a casing having an inlet opening and an outlet opening, a stop valve adapted to close against a seating in the casing, a hollow extension to said stop valve provided with a plurality of perforations adapted to allow the passage of the steam therethrough when the stop valve is open, and thereby et feet a drying of the steam, a casing within which said extension is adapted to slide, and ports within the extension beyond the perorations therein, and at the end thereoic nearer the inlet opening, said ports being ot a size to allow the 'free passage of the steam when said ports are raised clear of the last mentioned casing, y

2. A steam valve Vcomprising in combination, a casing having an inlet opening, and an outlet opening, a stop valve, a hollow extension to said stop valve provided with a plurality of perforations of substantially small size, wherethrough the steam passes to ell'ect a drying thereof, a casing within which said extension is adapted to slide, a valve seat on the outer end o'l said casing against which said stop valve is adapted to close, and ports in the extension beyond the peiiorations, and at the end of the extension nearer the inlet, said ports being of a size to allow the 'free passage of the steam when they are raised clear of the valve seat.

3. A steam valve comprising in combination, a casing having an inlet opening and an outlet opening, a stop valve adapted to close against a seating in saidV casing, a hollow extension to said stop valve provided with a plurality of small perorations adapted to allow the passage of the steam therethrough when the stop valve is partly open, to eli'ect a drying of thev steam, a casing in which said extension is adapted to slide, ports in the extensions beyond the perforations and at the end of said extension nearer the inlet opening, said ports being of a size to permit the free passage of the steam when the valve is fully opened, and means for guiding said valve.

1l. A steam valve comprising in combination, a casing having an inlet opening and an outlet opening, a stop valve adapted to close against a seat in said casing, a hollow extension to said stop valve provided with a plurality of small perforations, adapted to allow the passage of the steam therethroughv when the stop valve is partly opened, to effeet the. drying of the steam, a casing in which said extension is adapted to slide, ports in the extension beyond the perforations and at the end of said extension'nearer the. inlet opening, saidV ports being of a size to permit the tree passage of the steam when the valve is fully opened, means for guiding said valve, and means for balancing said valve. e

5. A steam valve comprising in combination a stop valve, a hollow cylindrical extension to said stop valve provided with a plurality of perforations adapted to allow of the passage of steam therethrough when the said stop valve is open, such perforations being of substantially small size whereby they effect a drying of the steam, a casing within which said cylindrical extension is adapted to slide, a valve seating on the outer end of said casing against which said stop valve is adapted to close, said cylindrical eX- tension being also provided with ports or the like adapted to allow of a free passage of the steam therethrough when such ports are raised clear of such seating, a second casing arranged within the steam space of the valve and co-axially with respect to said first mentioned casing, a piston within said second casing having an end thereof closed with the exception of one or more small holes therein allowing of the passage of steam to both sides of the pist-on, and means Connecting said piston with said valve member whereby said piston will function to balance said valve.

6. A nonreturn steam valve comprising a stop valve adapted to close against a seating and free to move towards or away from said seating under the pressure of the steam, a hollow cylindrical extension on said stop valve adapted to form a guide for said valve, such extension being provided with a plurality of perforations adapted to allow of the passage of steam therethrough when the said stop valve is partially open, and thereby effect a drying ot the steam, said cylindrical extension being also provided with ports adapted to allow ot a free pas- Sage of the steam therethrough when said said valve is fully opened7 and means for controlling the opening movement of said valve.

7. A nonreturn steam valve comprising a stop valve, a hollow cylindrical extension on said stop valve adapted to form a guide for said valve, such extension being provided with a plurality of perforations adapted to allow of the passage of steam therethrough when the said stop valve is open, and thereby eieet a drying of the steam, a casing within which said cylindrical extension is adapted to slide, a valve seating on the outer end of said easing' against which said stop valve is adapted to close, said cylindrical extension being also provided with ports adapted to allow of a free passage of the steam therethrough when such ports are raised Clear of such seating, and means for Controlling the opening lmove.- ment of said valve.

In testimony whereof I have aiiixed my signature.

PASQUALE PASCALE. 

